<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title> CSS Grid</title>
  <style>
    #box {
      width: 300px;
      height: 300px;
      display: grid;
      /* grid-template-columns: 1fr 1fr 1fr; */
    }

    .two {
      background: orange;
    }

    .one,
    .three {
      background: skyblue;
    }
  </style>
</head>

<body>
  <h1> CSS Grid</h1>
  <div id="box">
    <div class="one"></div>
    <div class="two">target item</div>
    <div class="three"></div>
  </div>

</body>

</html>